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Laminated Stator Core – Precision Magnetic Cores for BLDC Motors & UAV Propulsion
Motor efficiency limited by core loss? Stator lamination quality inconsistent? Need a reliable laminated stator core supplier?Alaminated stator core is the foundational magnetic component of every electric motor—a precision-stacked assembly of thin silicon steel laminations that minimizes eddy current losses while providing the magnetic circuit essential for electromagnetic energy conversion . As a laminated stator core supplier in China, Reenives delivers precision laminated stator cores with 0.2mm ultra-thin silicon steel, 12N14P or 24N22P configurations, burr height < 0.03mm, and epoxy coating—reducing core loss by up to 30%, maximizing motor efficiency, and extending operational life for drone, UAV, and industrial applications.
- •What Is a Laminated Stator Core?
- •Classification of Laminated Stator Cores
- •Technical Specifications & Verified Data
- •Applications: Drones, UAVs, Industrial & More
- •6-Step Engineering Selection Guide for Laminated Stator Cores
- •FAQ: Laminated Stator Core Technical Questions
- •Why Reenives – Laminated Stator Core Supplier in China
- •Dongguan Runlu Motor Technology Co., Ltd.
What Is a Laminated Stator Core?
Alaminated stator core is a stationary magnetic component constructed from multiple thin sheets of electrical steel (silicon steel) that are precision-stamped, stacked, and bonded—either through mechanical interlocks, welding, or adhesive lamination . This laminated construction is essential because a solid iron core would generate excessive eddy current losses under alternating magnetic fields .
Why laminated stator cores are critical for motor performance:
- Eddy current reduction – Thin laminations (0.15–0.20mm) restrict eddy current flow, minimizing core loss
- Precision geometry – Stamping ensures consistent slot/pole shapes for optimal magnetic flux
- Adhesive or interlock bonding – Advanced bonding methods improve structural integrity while maintaining insulation between laminations
- High stacking factor – Precision stamping and assembly enable ≥ 97.5% stacking density
ⓘ Laminated core insight:"The laminated stator core is the foundation of every efficient motor. A 10% reduction in core loss through precision lamination and bonding can increase motor efficiency by 5–8%."
Reenives manufactures precision laminated stator cores using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—ensuring optimal magnetic performance for demanding UAV, FPV, and industrial applications.
Classification of Laminated Stator Cores
Reenives supplies laminated stator cores across four primary series, tailored to different motor classes and performance requirements:
| Series | Stator OD (mm) | Slot/Pole Configuration | Lamination Thickness | Best For |
|---|---|---|---|---|
| Series A – Micro Drone | 12–20mm | 9N12P | 0.15–0.20mm | Micro drones, tiny whoops, sub-100g UAVs |
| Series B – FPV Racing | 22–30mm | 9N12P, 12N14P | 0.15–0.20mm | 3–5 inch FPV racing drones, freestyle |
| Series C – Mid-Size UAV | 30–50mm | 12N14P, 24N22P | 0.20mm | Logistics drones, camera platforms, agriculture |
| Series D – Heavy-Lift & eVTOL | 50–80mm | 24N22P, 36N30P | 0.20mm | Heavy-lift UAVs, eVTOL, cargo drones |
Laminated stator cores are optimized for different motor sizes and power classes:
- 9N12P (9-slot, 12-pole): Most common for FPV and racing motors—excellent torque, smooth operation
- 12N14P: Near-perfect winding factor (0.933), higher torque density—most popular for UAVs
- 24N22P: High torque, low cogging, ideal for heavy-lift and logistics drones
- 36N30P: Maximum torque density for eVTOL and extreme power applications
Technical Specifications & Verified Data
All performance data below is derived from Reenives in-house laboratory testing (IEC 60404-2), third-party validation, and industry standards for laminated stator cores.
| Parameter | Value / Range (Reenives Standard) | Test Standard / Source |
|---|---|---|
| Stator Outer Diameter | 12–80mm (customizable) | CMM / optical comparator |
| Lamination Material | 35PN210, 35PN250 (Nippon Steel / Baowu) | Material certificates |
| Lamination Thickness | 0.15mm / 0.20mm / 0.27mm / 0.35mm | Micrometer / IEC 60404-2 |
| Core Loss @ 1.0T, 400Hz (0.20mm) | ≤ 8.5 W/kg — 30% lower than 0.35mm | IEC 60404-2 / Reenives R&D |
| Saturation Flux Density Bs | 1.68 – 1.72 T | Epstein frame test |
| Burr Height (max) | < 0.03mm | Optical measurement |
| Epoxy Coating Thickness | 30–60 µm, dielectric > 2.5 kV | ASTM D149 |
| Stacking Factor | ≥ 97.5% | Weight method |
| Concentricity Tolerance | ±0.01mm – ±0.015mm | CMM measurement |
| Slot/Pole Configurations | 9N12P, 12N14P, 24N22P, 36N30P, custom | Reenives design standards |
| Winding Factor (12N14P) | 0.933 (near-perfect) | BLDC winding theory |
| Typical Motor Efficiency | 90–95% (with optimized stator) | IEEE Xplore / FEM simulation |
| Bonding Method | Mechanical interlock / Adhesive lamination | Reenives manufacturing standards |
🔬Data Source: Reenives R&D Report 2024-Q4 + IEC 60404-2 standard + Material certificates + IEEE Xplore motor studies.
Applications: Drones, UAVs, Industrial & More
Laminated stator cores power the full spectrum of motor applications:
| Application | Typical Stator Size | Stator Requirements | Performance Priorities |
|---|---|---|---|
| FPV Racing Drones | 22–30mm | Ultra-thin 0.15mm, high fill factor, low cogging | High RPM, rapid acceleration, responsiveness |
| Freestyle / Cinematic | 22–30mm | 0.20mm, smooth torque, thermal stability | Smooth control, consistent power, cooling |
| Logistics & Delivery | 30–50mm | 0.20mm, high efficiency, durability | Long flight time, payload capacity, reliability |
| Agriculture Spraying | 40–60mm | 0.20mm, corrosion-resistant coating | Heavy payload, dust/chemical resistance, power |
| eVTOL / Air Taxi | 50–80mm | 0.20mm, high power density, reliability | Safety, redundancy, high continuous power |
| Industrial Motors | 30–100mm+ | 0.20–0.35mm, cost-effective | Reliability, thermal stability, cost |
"A high-quality laminated stator core is the foundation of every efficient motor—from drone propulsion to industrial automation."
6-Step Engineering Selection Guide for Laminated Stator Cores
For motor designers and procurement engineers, selecting the optimal laminated stator core requires systematic evaluation. Here is a practical 6-step framework:
- Define Motor Class & Performance Requirements – Identify your motor's intended application:
- FPV racing: High RPM, rapid acceleration, lightweight
- UAV logistics: Long flight time, high payload, efficiency
- Agriculture: Heavy lift, dust/chemical resistance, durability
- eVTOL: Safety, redundancy, high continuous power
- Industrial: Reliability, thermal stability, cost-effectiveness
- Select Stator Outer Diameter – Match motor size to power class:
- 12–20mm: Micro motors, tiny whoops
- 22–30mm: FPV racing, freestyle (most popular)
- 30–50mm: Logistics, agriculture, camera platforms
- 50–80mm: Heavy-lift, eVTOL, cargo drones
- 80–200mm: Industrial motors, generators
- Choose Lamination Thickness – Thinner laminations reduce core loss at high frequencies:
- 0.15mm: Ultimate high-RPM performance, racing motors
- 0.20mm: Optimal balance—most applications
- 0.27–0.35mm: Industrial motors, cost-effective
ⓘ"Using 0.20mm silicon steel reduces core loss by approximately 30% compared to 0.35mm—translating to longer motor life and higher efficiency."
- Define Slot/Pole Configuration – Match to motor characteristics:
- 9N12P: Most common for FPV—excellent torque and smoothness
- 12N14P: Near-perfect winding factor (0.933)—most popular for UAVs
- 24N22P: High torque, low cogging, heavy-lift applications
- 36N30P: Maximum torque density for eVTOL
- Specify Bonding & Coating Method – Critical for core integrity and insulation:
- Mechanical interlock: High-strength, cost-effective
- Adhesive lamination: Superior insulation, reduced vibration
- Epoxy coating: 30–60µm, Class H 180°C, dielectric > 2.5 kV
- Choose a Leading Laminated Stator Core Supplier – Evaluate expertise:
- Experience with laminated stator core designs (9N12P, 12N14P, 24N22P, etc.)
- Ultra-thin lamination capability (0.15–0.20mm)
- Precision stamping: burr < 0.03mm, concentricity ±0.01mm
- Advanced bonding capabilities (interlock/adhesive)
- Material certificates and third-party test reports
- Proven track record with motor manufacturers
- Responsive engineering support for motor optimization
FAQ: Laminated Stator Core Technical Questions
A laminated stator core is a stationary magnetic component constructed from multiple thin sheets of electrical steel that are precision-stamped, stacked, and bonded. Lamination is critical because: (1) it minimizes eddy current losses by using thin insulated layers instead of a solid core , (2) precision stamping ensures consistent geometry for optimal magnetic flux, (3) advanced bonding methods (interlock or adhesive) improve structural integrity while maintaining interlaminar insulation , and (4) high stacking factor maximizes magnetic material density—all of which directly impact motor efficiency, torque, and thermal performance.
Mechanical interlock is a stamping process where small protrusions on each lamination snap into corresponding recesses on adjacent laminations—creating a strong mechanical bond without added materials. This method is cost-effective and widely used . Adhesive lamination uses a fast-curing and thermosetting adhesive applied between laminations, which is then cured under pressure and heat . This method offers: (1) superior electrical insulation between laminations, (2) reduced vibration and noise, (3) excellent structural integrity, and (4) minimized iron loss. Reenives supports both bonding methods depending on application requirements.
The optimal lamination thickness depends on the motor's operating frequency. For high-frequency drone motors (up to 40 kHz PWM), 0.15–0.20mm laminations are optimal. 0.20mm achieves core loss ≤ 8.5 W/kg at 400Hz—approximately 30% lower than 0.35mm material. For industrial motors operating at lower frequencies (50–400 Hz), 0.27–0.35mm laminations provide a cost-effective balance of performance and cost . Thinner laminations reduce eddy current losses but increase manufacturing complexity and cost.
9N12P (9-slot stator, 12-pole rotor) is the most common configuration for FPV racing motors, offering excellent torque-to-weight ratio and smooth operation. 12N14P is the most popular for UAV motors, delivering a near-perfect winding factor of 0.933 and exceptionally low cogging torque. 24N22P is preferred for heavy-lift and logistics UAVs, while 36N30P is used for eVTOL applications. Reenives supports all these configurations with custom tooling.
Burr height is the raised edge left on stamped metal after the punching process. In laminated stator cores, burr height must be maintained below 0.03mm because excessive burrs can: (1) damage enamel insulation on copper windings during assembly, causing short circuits, (2) create localized magnetic saturation points that reduce efficiency, (3) increase core loss through eddy current concentration, and (4) reduce motor reliability. Reenives maintains burr height < 0.03mm through precision progressive stamping dies.
Epoxy powder coating provides three critical functions for laminated stator cores: (1) electrical insulation between laminations to minimize eddy currents and prevent interlaminar shorts, (2) corrosion resistance for operation in humid and demanding environments, and (3) thermal durability up to 180°C (Class H) to withstand the heat generated during high-power operation. The coating thickness (30–60µm) is optimized with dielectric strength exceeding 2.5 kV.
Yes. Reenives supports full customization of laminated stator cores including: stator outer diameter (12–200mm), lamination thickness (0.15–0.35mm), slot/pole configurations (9N12P, 12N14P, 24N22P, 36N30P, custom), stacking height, material grade, bonding method (mechanical interlock or adhesive lamination), and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights—from micro FPV motors to heavy-lift eVTOL propulsion systems.
Why Reenives – Laminated Stator Core Supplier in China
Reenives has earned its reputation as a laminated stator core supplier in China by combining advanced manufacturing technology with deep expertise in motor design and a reliable global supply chain.
Our Advantages — Laminated Stator Core Specialists
- ✅Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—extending motor life and efficiency
- ✅Precision Progressive Stamping: Burr height < 0.03mm, concentricity ±0.01mm, stacking factor ≥ 97.5%
- ✅Advanced Bonding Methods: Mechanical interlock and adhesive lamination options
- ✅Wide Range of Configurations: 9N12P, 12N14P, 24N22P, 36N30P, and custom designs
- ✅Full Customization: Private mould development, tailored stator diameters, and custom stack heights
- ✅Trusted Quality Control: IEC 60404-2 testing, third-party verification, and material certificates
- ✅Motor Core Expertise: 4 years of experience with 1,000+ enterprise clients—specializing in motor propulsion
- ✅Global Export Capability: Complete export qualifications with worldwide shipping
- ✅100+ R&D Patents: Continuous innovation in laminated stator core technology
🔧Our laminated core promise: Precision electromagnetic cores that deliver longer motor life, higher efficiency, and cooler operation. Consistent quality that eliminates rework. Technical support that understands motor design. That's why Reenives is the trusted laminated stator core supplier in China.
⚡ Ready to power your motors with precision laminated stator cores?
Contact Reenives today for engineering consultation, OEM samples, and competitive global pricing.
📱 WhatsApp: +86-13377741885
Dongguan Runlu Motor Technology Co., Ltd.
Reenives — Professional Drone Stator Core Manufacturer
Founded in 2022, Reenives has rapidly grown into a laminated stator core supplier in China for the global UAV, FPV, and industrial motor markets.
Independent R&D Technology · Imported stamping & epoxy powder coating production lines · Dust-free workshops · 4 years of manufacturing experience · Solved laminated stator core challenges for 1,000+ enterprises worldwide—including leading drone motor manufacturers.
From production to sales, we support bulk purchasing,private mould development, and sample making. We provide tailor-made solutions for your specific motor production scenarios—with competitive global pricing, consistent quality, and reliable on-time delivery.
🌐www.reenives-bldcmotor.com | 📧 linda_reenives@163.com | 📱 +86-13377741885
✈️ Global motor manufacturers welcome — consult, visit the factory, or request free samplestoday!
Reenives — Laminated Stator Core Supplier in China
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